A dark green convertible Audi used by Diana, Princess of Wales, is expected to fetch up to £80,000 at auction.

Diana was loaned the A4 Cabriolet 2.3E for personal use as a family car in 1994 and ferried Princes William and Harry around in it during the summer months that year.

Finished in metallic Gomera green paintwork, with the original light beige hide interior, it has automatic transmission, an electric hood and windows, sports steering wheel and walnut dashboard.

With only 21,858 miles on the clock, the car, which has the number plate L449 TRP, has changed hands several times but is described as being in very good original condition.

It travelled around 4,000 miles with Diana until it was returned to Dovercourt Audi in July 1994.

A spokesman for the auctioneers Cheffins said: "We have seen dresses and jewellery sell for exceptional prices over the last 20 years since the tragic death of Diana, Princess of Wales, and consider this to be a rare opportunity to purchase one of only a handful of cars that can be directly connected to the royal princess, seen so regularly in the press in 1994."

The car will go under the hammer at Cheffins in Cambridge.